ERROR_CLUSTER_GROUP_SINGLETON_RESOURCE - 5941 (0x1735)
Only one instance of this resource type is allowed per resource group.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_CLUSTER_GROUP_SINGLETON_RESOURCE error code indicates that a resource type is configured to be a singleton within its cluster group. This means that only one instance of this specific resource can exist in the entire cluster, and it must be associated with the cluster group.
Error Details
This error typically occurs when an attempt is made to add or manage a resource that conflicts with the singleton nature of another resource type within the same cluster group. The error suggests that the system expects only one instance of this particular resource type per cluster, and any additional instances would violate this constraint.
Usage Context
This error code can be encountered in various scenarios involving cluster management and resource allocation. It is particularly relevant when dealing with failover clusters where resources need to be uniquely identified and managed across multiple nodes.
Developer Interpretation
Developers should understand that the presence of this error indicates a configuration issue or an attempt to violate the singleton constraint for a specific resource type within a cluster group. The developer must ensure that only one instance of the specified resource is present in the cluster, and any operations attempting to add another instance will result in this error.
Related Errors
ERROR_CLUSTER_GROUP_RESOURCE_DOES_NOT_EXIST(0x80240016)ERROR_CLUSTER_GROUP_INVALID_STATE(0x80240039)ERROR_CLUSTER_GROUP_NAME_EXISTS(0x8024005B)
FAQ
Q: What does the ERROR_CLUSTER_GROUP_SINGLETON_RESOURCE error mean?
A: This error indicates that a resource type is configured as a singleton within its cluster group, meaning only one instance of this resource can exist in the entire cluster. Any attempt to add another instance will result in this error.
Q: How can I resolve this error?
A: Ensure that only one instance of the specified resource exists in the cluster and that no conflicting operations are being performed.
Summary
The ERROR_CLUSTER_GROUP_SINGLETON_RESOURCE error code is a specific technical indicator used by Windows to enforce singleton constraints on certain resources within failover clusters. Developers should be aware of this constraint when managing cluster resources to avoid encountering this error.